Caterpillar Industrial Power Systems Division introduced
new three- and four-cylinder diesel engines, with displacements of 1. 5 and 2. 2 L, targeted to original equipment
manufacturers requiring their products to meet both EPA
Tier 4 final/EU Stage 3a/Stage 3b emissions regulations,
Cat said. The two new engines, the C1.5 and the C2. 2,
provide ratings from 32 to 61 hp.

For these two new engines, the aftertreatment module
will use active regeneration to periodically burn away particulate matter that collects in the DPF. The regeneration
process is transparent to the equipment operator, Cat said,
and has no adverse effect on the machine’s duty cycle.
Periodic cleaning of ash residue from the DPF is required,
but typically only at 3000-hour intervals, or several years of
many machine operations.

In addition, Cat said, the design of the new engines
effectively controls heat rejection, meaning that cooling
requirements will not consume space within the constraints of a small machine’s overall layout. This advantage, said Cat, allows OEMs to maintain compact dimensions — critical in the small-machine market — while
maintaining easy serviceability.